仿生冷却:用撒哈拉银蚁微结构对可生物降解壳聚糖薄膜进行功能化。

IF 3.4 3区 医学 Q1 ENGINEERING, MULTIDISCIPLINARY
Markus Zimmerl, Richard W van Nieuwenhoven, Karin Whitmore, Wilfried Vetter, Ille C Gebeshuber
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引用次数: 0

摘要

越来越多的炎炎夏日给人类和动物都带来了压力,尤其是在城市地区,即使在夜间,气温也会居高不下。有生命的大自然提供了潜在的解决方案,只需最低的能源和材料成本。例如,撒哈拉银蚁(Cataglyphis bombycina)可以通过其三角形蚁毛引起的被动辐射冷却来忍受沙漠的炎热。本研究的目的是将银蚁身体的微纳米结构甲壳素毛发的被动辐射冷却特性转移到技术上可用、可生物降解和生物基材料上。辐射冷却特性的大规模转移(例如转移到房屋外墙等建筑物外部)可减少对传统冷却的需求,从而降低能源需求。壳聚糖是甲壳素的一种化学变化形式,具有一系列医疗用途,但也可以加工成类似纸张的薄膜。加工过程包括将壳聚糖溶解在稀释的醋酸中,然后均匀地分布在一个平面上。然后在薄膜干燥时将功能结构压印到薄膜上。本研究报告成功地将基于微观结构的光盘(CD)结构颜色转移到了薄膜上。同样,银蚁体的聚乙烯硅氧烷印记也可以将冷却功能转移到技术相关的表面上。通过傅立叶变换红外光谱法测量平面和结构化壳聚糖薄膜的反射率,可以对红外发射率进行定性评估。如果在相关波长范围内反射率略有下降,则表明可以提高发射率,从而降低表面温度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Biomimetic Cooling: Functionalizing Biodegradable Chitosan Films with Saharan Silver Ant Microstructures.

The increasing occurrence of hot summer days causes stress to both humans and animals, particularly in urban areas where temperatures can remain high, even at night. Living nature offers potential solutions that require minimal energy and material costs. For instance, the Saharan silver ant (Cataglyphis bombycina) can endure the desert heat by means of passive radiative cooling induced by its triangular hairs. The objective of this study is to transfer the passive radiative cooling properties of the micro- and nanostructured chitin hairs of the silver ant body to technically usable, biodegradable and bio-based materials. The potential large-scale transfer of radiative cooling properties, for example, onto building exteriors such as house facades, could decrease the need for conventional cooling and, therefore, lower the energy demand. Chitosan, a chemically altered form of chitin, has a range of medical uses but can also be processed into a paper-like film. The procedure consists of dissolving chitosan in diluted acetic acid and uniformly distributing it on a flat surface. A functional structure can then be imprinted onto this film while it is drying. This study reports the successful transfer of the microstructure-based structural colors of a compact disc (CD) onto the film. Similarly, a polyvinyl siloxane imprint of the silver ant body shall make it possible to transfer cooling functionality to technically relevant surfaces. FTIR spectroscopy measurements of the reflectance of flat and structured chitosan films allow for a qualitative assessment of the infrared emissivity. A minor decrease in reflectance in a relevant wavelength range gives an indication that it is feasible to increase the emissivity and, therefore, decrease the surface temperature purely through surface-induced functionalities.

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来源期刊
Biomimetics
Biomimetics Biochemistry, Genetics and Molecular Biology-Biotechnology
CiteScore
3.50
自引率
11.10%
发文量
189
审稿时长
11 weeks
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